Pump



l.' W. WEPPLO.

PUMP.

APPLICATION FILED Nov. I5, I92o.

1,415,617. Patented May 9, 1922.

fnl/enfer UNnllatiD1115svv PAT i ISAAdfWwEPH-AO; @F CHICAGO, i-LINOiSJ To aZZ/who'mitmay `conociera.

` citizen'of the United States, andV resident y Y of Chicago, inthe county ofCook andfState- Improvements in. Pumps, df whichv theasfol-l A refers more particularly to means for lubri-fv of Illinois, have inventednew anduseful lowingis a specification... n Y [This inventio'nhas relation kto'- `a pump and' Fig. 1 shows, 4in `side elevation,"and` partly 1n section, va pump structure embo'dylng'fthe invention, andv .v y v `Fig. 2 is an enlarged'view ofthe piston "of said structuregf u The 'reference numeralV 1 denotes pump 'cylinder fitted `at* the top with a valve mechanism '2, which"throughv the -`medium of lan arm 3, -a' connectii'igrodjf and, alever' is connected'to bev operated from'jthenrank 6`- of a crank shaft"7.` The latter kisffsuitably supported, as'l by a l,plurality of bearing' stands such as shown 'at 8, 'and said stands mayy be mounted o'njaY base 9. ,The crank shaft 7 lis provided with a second crank 10 shaped tooperate ina slot 11a of the `pistonI 'rod yhead 11. The cylinder/11' isl rigidly` mounted above the base 9 throughthe Ine-- dium` of a suitable supporting stand 28. l

`The .crank shaft 7 is rotated byanyrysuitable means '.(not shown), and itis yconri'ectedv to' reciprocate" a pistonA 21 within cyliinder 1, through, the" medium' of^the`" saidv` crank'10,iwhich,"as stated, rides in the slot. 11a of the piston rod. The valve mechanism comprises a cylindrical stem 12 having an L-shaped passage A12a for registration with an inlet port 14 and an outlet port 13. Rigid on one end of the valve stem is the arm 3 which, as stated, is operatively connected with the lever 5.

The crank shaft 7 is rotating. in a clock-` wise direction, and it is, in the position yPurline'.

Specification ofLettersPaten-t. v f I-iaienjgel 9,71 fnplnicatioiisma November 15,1920. p serial No'. 424,256. i

' showninthe-drawing, pushing-fthe piston upward and discharging lthe 'contents ofvfthe cylinderthrough-the -outletjport 13.' The pistonl is'at vthis time traveling at its-maxil `mum speed', and' the speedwifll-now gradu# allydecre'ase. The arm v5,-and therethrough the valvestem l2,`on, the other hand, is now at a stand-still, with the dischargel portfull" open,` andgit isjust at the point beginning itsdownward movement. When the pistonl ce y reaches the top of-its movement-*itis found..

that Ithe outlet port 13 willi-be closed and that the inlet po-rt'isjust commencingto open, and l it will open very fast. As the pistonthen 4 commences to descend-'with increasing-speed it' is ifoundf thatfthe vvalve stein' gradually cornes to a stop. Andwhen the pistongradu-Y allyflo'ses speed' ItowardY the-end! ofl its -down stroke,-r itis noticedv 'that -the valve fstenr quickly" picksV up speed, fso"` as `to close the inlet port by the time the piston reaches the bottom. In' other words-,there are two crank movements,- controlledby -the two eranksi and 10, so related that; when' one isi at itsr highest speed thefotherv is 'found' substantially at rest? on or near its dead center. f ThisV is necessary in' order lthat one' port oriy theother may be open 'during theftravel off the piston.-

fi" i of 'Course-,iria wish itV emailsandv that. the

structure illustrated in thedrawing is not'y shown mechanically perfect^,-and that minor mechanical refinements,A such as the relativepositions of the cranks and'the Hshape of the slots in whichk the'fcranks` operate, are.'

Now it is important to notev that the piston 2l is made with two heads 29 and 30, and the construction of said heads may be identical, if preferred. Between the said heads is an annular` space, due to which a chamber 15 is formed when the piston is in position. A passage 16, ora plurality ofpsuch passages, leads from 4said chamber, through a Q 90:9 carried' out'in the )design of the'fpump'aetu'f# duct 17"L of the piston rod 17, thence through a tube 18, and terminates within a lubricant receptacle 19. This receptacle, which may be of any standard shape and construction, is positioned well above the cylinder, and this feature is very important for the reason that a great deal of pressure is thereby exerted. upon the lubricant confined within chamber 15. The object ofV maintaining the lubricant within said chamber under pressure is in the first place to insure perfect and sufficient lubrication of the piston head, but also, and this is even more important, to seal the passage from the outer atmosphere to the space above the piston.

My invention is primarily intended for use in establishments making heavy fluids, such as tooth paste. The lubricant used is of a nature analogous to the composition of such paste, as for instance glycerine.v The problem is to deliver an exact amount to the paste receptacle, which in this case is a collapsible tube. lll/*ith a pump of ordinary construction, such as has heretofore been used in such establishments, it has been found that more or less lair would find its way into the pump kchamber at each stroke, and that therefore the quantity delivered would vary. lIhis again necessitated the delivery of an excess amount and a consequent waste.

The stroke of the piston of my invention is adjustable by suitable means, such as a screw joint 2O in the piston rod, and by thus adjusting the stroke, I am able to deliveran exact amount kto each tube. Anyone who has witnessed the enormous waste in a large tooth paste establishment, caused by the overflowing of the tubes in filling, will appreciate the importance of my invention, and the great saving eected.

More specifically the piston comprises the body portion 21 and the integral shank or rod 17, and this rod is provided with screw threads 17 a. A cylindrical stud 21 extends upward from the body, and this stud is made with screw threads 21h. The piston head 29 is placed on said stud, whereupon a nut 25 is applied to the screw threads and for the purpose of locking the piston head in position. It is noticed, in Fig. 2, that' this nut has not been turned up tight, for the sake of clearness, but the structure is shown fully assembled in Fig. 1. The piston head 30 is put in position from the bottom of the piston rod 17, before the pipe` 18 is attached,

and it is then similarly tightened in position by a nut`26.

The piston head 29 comprises a pair of cup shaped rings 22, which are placed back to back and loosely fitted on the stud 218. Within each ring, and' slidably fitted on the stud, is a grooved disc 23, and within the groove of each disc is placed a spring ring, theV function of Which is to urge the ring against the sides of the cylinder. The piston head 30 may be of exactly the same construction, the only dierence in shape being that the hole in the rings and discs must be large enough to slip over'the screw threads 17". The cup shaped rings 22 are made of suitable fiexible material, such as leather, and the back to back relation of each pair is important, as it insures a tight joint on each side of the piston body 21 both on the up and down stroke. Hence no air can get into the space 15 from the bottom, and no paste can enter from the top, and the space is always full of glycerine.

In the above description I have set forth i very clearly the construction and operation of my invention. I wish to state, in con clusion that I may modify this construction f to suit operating conditions so long as the salient features as set forth in the annexed claims, are preserved.

I claim:

1. In a measured delivery pump, a reciprocating piston, an oscillating valve, means for operating said piston and valve in the proper time relation, said iston having a central body and a pair of eads, lone head attachable from each side of said body, each head comprising apair of fiexible rings and having resilient members urging said rings against the sides of the cylinder, and means for maintaining the space between said heads constantly lled with lubricants.

2. A piston having a cylindrical body and provided with rods extending both ways, oneV rod connected for imparting reciprocations to the piston, screw threads on both rods in spaced relation to the body, a piston head attached from each end and held clamped y against the body by threaded'nuts engaging said screw threads, each head comprising a pair of cup shaped rings assembled back to back, grooved discs within each cup for spacing purposes, and resilient members in the grooves of said discs and yieldingly pressing against the inner periphe of said rings.

ISAA W. WEPPLO. 

